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Reflects shares delivered by reporting person to satisfy withholding taxes due upon vesting of restricted shares granted on December 14, 2007.

This transaction was executed in multiple trades at prices ranging from $25.24 to $25.2515. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.